728 N E R 
27. Nerita radula: fliell grooved, with equal tubercles. 
It inhabits the Indian iflands, and is the fize of a walnut. 
This is reprefented, in two different pofitions, at the upper 
corners of Conchology Plate V. 
28. Nerita cornea : fhell obfoletely ftriate. It inhabits 
the Red Sea. The fhell is fragile, brown, white, or pale 
violet, with longitudinal white or teftaceous bands. 
29. Nerita fluviatilis: fhell rugged,, fpotted, ftreaked, 
or reticulate. There are four varieties that inhabit the 
rivers of Europe and Barbary ; the fhell is not half an 
inch long. 
30. Nerita littoralis: fhell fmooth, with a carious crown, 
and four whorls. It inhabits the fea rocks of Europe, 
and is the fize of a horfe-bean. The fhell is yellow or 
ferruginous, with or without bands, fpots, or dots, of 
various colours. 
31. Nerita lacuftris : fhell frnoothifh, horny or blackifh, 
ending in an exquifitely-fine point. It inhabits flill waters, 
and the warm fprings of Europe; and very much refembles 
the preceding. 
32. Nerita Magdalente: fhell with wide grooves, black, 
but within white, the lip yellowifh ; the lid is fmooth, 
and two-toothed. It inhabits Magdalena-ifland in the 
Southern Ocean, and is more than half an inch long. 
33. Nerita marginata: fhell thin, with decuffate ftria;, 
tuberculate, black, with ochraceous fpots, fubglobular; 
aperture margined outwardly. 
34.. Nerita dubia: fhell thin, pellucid, ovate, polifhed, 
dull yellow, varied with black; outer lip acute, inner 
glabrous. This is a very rare fhell, and its place of refi- 
dence is not known. 
35. Nerita pellucida: fhell fmooth and pellucid, with 
three whorls. 
36. Nerita alba: fhell fmooth, fubpellucid, with two 
whorls. This is found with the lad on the Pembroke- 
fhire coaft ; both are very minute. 
III. Imperforate, with lips toothed. 
37. Nerita pulligera: fhell fmooth, coarfe, with an ex¬ 
cavated eye-like fmall l'pire ; inner lip fmooth, crenulated. 
38. Nerita undulata: fhell thin, fmooth, undulate; crown 
obtufe; outer lip fubftriate and toothlefs; inner one a 
little denticulate. 
39. Nerita aterrima : fhell thick, opaque, globular, deep 
black with coloured lines, within white; outer lip gla¬ 
brous, inner lip tuberculate, and wrinkled. 
40. Nerita larva : fhell fmooth, fubglobular, white, with 
yellowifh-brown bands; crown obtufe; lip flightly den¬ 
ticulate. It is found at Amboyna, though it is very rare. 
41. Nerita pupa: fhell fmooth, roundifh, milk-white, 
With tranfverfe parallel black ftriaeon the whorls; the lip 
is flat, with hardly-vifible teeth. 
42. Nerita bidens : fhell fmooth; inner lip tw'o-toothed. 
The fhell is the fize of a pea, and is either black or reddifh, 
obfoletely ftriate, fometimes of a pale yellow, with whitifh 
clouds, and three black bands. 
43. Nerita viridis : fhell fmooth and green ; the inner 
lip crenulate in the middle. It inhabits Minorca and 
Jamaica. 
44. Nerita virginiata: fhell fmooth, ovate; inner lip 
denticulate. Found in the rivers of India and South 
America ; from two to ten lines long. 
45. Nerita polita : fhell fmooth, with' an obliterated 
crown ; the lip toothed on each fide. There are four 
varieties, found in the Indian and South Seas. The fhell 
is ovate, folid, polifhed, varioufly ornamented with fpots, 
clouds, and bands, or varied with black and white. 
46. Nerita peloronta : fhell ftriate; lips toothed, the 
inner one flattifn and wrinkled. It inhabits the Ameri¬ 
can iflands. It refembles the N. grofla; but is of a red 
colour, the grooves are-not fo deep, the outer lip is not 
crenate, and the inner one not convex. 
47. Nerita albicilla: fhell ftriate; lips flightly toothed, 
the inner one tuberculate. It is found in the I ltd i an 
Ocean, and on the fhores of the Cape of Good Hope. 
I T A. 
48. Neritahiftrio : fhell grooved and tranfverfely ftriate; 
inner lip toothed. 
49. Nerita plicata: fhell grooved; lips toothed, the outer 
one with acute conic teeth on each fide. This is found 
in divers parts of India. 
50. Nerita grofla: fhell grooved ; lips toothed, the inner 
one convex and wrinkled. It is found about the Mplucca- 
iflands. The fhell is rounded, white, with black and 
cinereous veins; the crown is a little prominent; the firffc 
whorl has thirteen or fourteen ribs; outer lip crenulate 
outwardly and toothed within ; inner lip white, with a 
yellow fpot, and three or four teeth. 
5r. Nerita chamseleon: fhell with twenty grooves; lips 
toothed, the inner one wrinkled and tuberculate. It in¬ 
habits the Indian Ocean. ‘ The fhell is varied with alter¬ 
nate undulate black-and-white rays, or yellowifh, undu¬ 
late with black-and-white, fubglobular; the ribs are un¬ 
equal, and crofted by very fine lines; the crown is depreffed 
and lateral. 
52. Nerita undata: fhell with thirty grooves; liptoothed, 
the inner one wrinkled and tuberculate. It inhabits the 
Indian Seas. 
53. Nerita exuvia: fhell grooved; lips toothed; the 
inner one tuberculate. It is found on the Indian coafts. 
See Conchology Plate X. fig. 1, 2. 
54. Nerita maxima: fhell folid, thick, glabrous, with 
undulate black and yellowifh rays; outer lip toothlefs; 
inner one a little concave, and four-toothed. The fhell 
is very large, within and at the aperture fnowy; inner lip 
fmooth, and very broad. 
55. Nerita textilis: fhell marked with angular black 
lines, and fixteen crenate ribs and grooves; the outer lip 
is crenate without, and toothed within; innerlip wrinkled 
above and tuberculate beneath; the palate is toothed. 
56. Nerita atrata: fhell deep black, glabrous, and very 
thinly ftriate above ; both lips white, the outer one very 
thinly grooved, and flightly toothed within, the inner 
one concave, wrinkled, and tuberculate. It inhabits the 
Atlantic, American, and South, feas. 
57. Nerita Afcenfionis: fhell with fixteen grooves; the 
ribs are fpotted with white, and the crown is a little pro¬ 
minent; the outer lip is glabrous on each fide; and the 
inner one a little concave, yellowifh, and toothed. It in¬ 
habits Afcenfion-ifland, and is a large lpecies ; the crown 
is generally worn down, rarely black ; and the lid is thin 
and pellucid. 
58. Nerita lineata : mouth of the fhell and both lips 
white, whorls round, furrounded with black parallel 
Arise, the fpaces between the ftriae violet; outer lip ftriate 
within. It is found in the Malacca-feas. 
59. Nerita verficolor : fhell with blackifh, bluifh, red, 
and white, fquare fpots, and bands fpotted with red and 
white; the inner lip is ftriate within, and toothed on 
each fide. It inhabits the Antille-iflands. The fhell is 
fet with round whorls; the crown is a little prominent; 
innerlip wrinkled above, and four-toothed beneath, the 
middle teeth larger. 
60. Nerita pica: fhell white, radiate with black with¬ 
out, with tranfverfe, rounded, fmooth, ftrise; inner lip 
wrinkled, and four-toothed. This is found in the In¬ 
dian Seas. The crown is a little prominent; the outer 
lip crenate without, and ftriate w-ithin. 
61. Nerita coftuta : fhell yellowifh within, fubglobular, 
furrounded with thicker Arise; the interftices fnowy; 
both lips toothed, the outer one crenate without; inner 
one fubconvex, wrinkled, and tuberculate. It inhabits 
the Nicobar-iflands. 
62. Nerita quadricolor : fhell fubviolet, with a yellowifh 
tip; within it is white, with elevated black ftrne; both 
lips toothed; the outer one grooved within, inner one 
wrinkled. It inhabits the Red Sea. \ 
63. Nerita Malaccenfis: fhell grooved,yellowifh within ; 
crown a little prominent; outer lip unarmed, and cre¬ 
nulate outwardly ; inner li p yellowifh, fmooth. This is 
found on the coaft of Malacca. 
64. Nerita 
